/*
 * Copyright (c) 2021, MegaEase
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.megaease.easeagent.report.trace;

public class Platform {
    static final ThreadLocal<char[]> SHORT_STRING_BUFFER = new ThreadLocal<>();
    /** Maximum character length constraint of most names, IP literals and IDs. */
    public static final int SHORT_STRING_LENGTH = 256;

    /**
     * Returns a {@link ThreadLocal} reused {@code char[]} for use when decoding bytes into hex, IP
     * literals, or {@link #SHORT_STRING_LENGTH short strings}. The buffer must never be leaked
     * outside the method. Most will {@link String#String(char[], int, int) copy it into a string}.
     */
    public static char[] shortStringBuffer() {
        char[] shortStringBuffer = SHORT_STRING_BUFFER.get();
        if (shortStringBuffer == null) {
            shortStringBuffer = new char[SHORT_STRING_LENGTH];
            SHORT_STRING_BUFFER.set(shortStringBuffer);
        }
        return shortStringBuffer;
    }
}
